Spectroscopy of blue supergiants in NGC 300
Abstract
We have obtained VLT low-resolution (~5 A) multi-object spectroscopy in the 4,000-5,000 A spectral range of about 70 blue supergiant candidates in the Sculptor Group spiral galaxy NGC 300. We present a detailed spectral catalog containing identification, magnitudes, colors and spectral types. We employ synthetic spectra to determine metal abundances for two A0 supergiants of the sample. In agreement with the expectations, the star closer to the galactic center is found to be more metal rich than the object at a larger galactocentric distance. Using the Balmer Hbeta line profile we have estimated the mass-loss rate for one of the brightest A2 supergiants in the sample. We determined the wind momentum of the star and compared it to the value expected from the empirical wind momentum-luminosity relationship (WLR) for A-type supergiants of Kudritzki et al. (1999). Good agreement is obtained.
Cite
@article{arxiv.astro-ph/0111070,
title = {Spectroscopy of blue supergiants in NGC 300},
author = {Fabio Bresolin and Wolfgang Gieren and Rolf-Peter Kudritzki and Grzegorz Pietrzynski and Norbert Przybilla},
journal= {arXiv preprint arXiv:astro-ph/0111070},
year = {2009}
}
Comments
28 pages, including 16 figures and 3 tables. Figures 1-5 submitted as JPEG files. Accepted for publication in The Astrophysical Journal